* {
    margin: 0;
    padding: 0;
}
.box {
    position: relative;
    width: 685px;
    height: 300px;
    left: 200px;
    top: 330px;
    overflow: hidden;
}
ul{
    position: absolute;
    width: 1000%;
}
.box a {
    display: none;
    position: absolute;
    z-index: 2;
    top: 50%;
    width: 24px;
    height: 40px;
    background: rgba(0,0,0,.3);
    text-align: center;
    line-height: 40px;
    color: #fff;
    font-size: 20px;
    text-decoration: none;
}
.box .arrowr{
    right: 0;
}
ul li {
    width: 685px;
    float: left;
    list-style: none;
}
ul li img{
    width: 685px;
    height: 300px;
}
.back {
    position: absolute;
    bottom: 0px;
    width: 685px;
    height: 45px;
    background: rgba(0,0,0,.3);
}
ol{
    position: absolute;
    bottom: 15px;
    left: 80%;
}
ol li{
    display: inline-block;
    list-style:none;
    margin-left: 10px;
    width: 10px;
    height: 10px;
    border: 2px solid transparent;
    border-radius:50% ;
    background-color: #fff;
    vertical-align: middle;
    cursor: pointer;
    transition: all .2s;
}
ol .current{
    width: 12px;
    height: 12px;
    background-color: #00a1d6;
    border-color: white;
    box-sizing: content-box;
}
